20 amp fuse number 12, fuse pannel located by driver's left knee.
If it suddenly stopped working at all speeds, it probably is a blown fuse.
The fuse box is located in the glove box on 1991 Buick Century
Is there a fuse box under the hood
A picture of the fuse panel is in the owners manual. You can also find a picture in a repair manual that you find at your local auto part dealer.
Check bulbs Check fuse for parking/tailights Could be a bad switch
under the back seat....
Under the back seat
if you have that manual go to the fuse box section, see what fuse it is and pull it out.
The fuse box for a 1998 Buick Park Avenue is located just below the dash near the driver's side floor board. It houses most of the essential fuses required to operate the vehicle.
check the charging fuse and the fuse able link on field wire
Pull the fuse or fuel pump relay.